Explanation:
Recall the equation for time is distance divided by speed. Here you can use that to solve for "t".
Answer:
conduction.
Explanation:
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The answer is A. waterfall
To be considered as an engine , it should be a Man-made objects that could be used to produce power that creates motions.
From all the options above could be used to produce such power, but the waterfall is not made by mandkind